Product description
Digital stereo amplifier with I²S interface and 2 x 3 W output power. The module from Adafruit is based on two MAX98357A ICs and combines digital-to-analog conversion (DAC) and Class D amplification on a compact circuit board. It can be connected directly to Raspberry Pi, Arduino, ESP32 and other microcontrollers with an I²S audio output.
The amplifier receives digital stereo audio via I²S and converts the signals into amplified audio for two separate speakers. Each channel can deliver up to 3.2 W at 4 Ω or 1.8 W at 8 Ω, with a 5 V supply voltage and 10 % THD. Class D technology provides high efficiency, making the module suitable for battery-powered applications.
The gain can be configured in five steps between 3 and 15 dB using resistors or solder jumpers on the circuit board. The default setting is 9 dB. The module features built-in overtemperature and short-circuit protection, as well as functions that reduce popping and clicking sounds during power-on and power-off.
The speaker outputs are bridge-tied load (BTL) and connect directly to the speakers without a common ground connection.
The module is supplied fully assembled and tested, with pre-installed screw terminals for speaker connections. A pin header is included for connection to breadboards or prototyping boards. The pin header is not pre-soldered.
Specifications:
- Manufacturer: Adafruit
- Product number: 6513
- Amplifier ICs: 2 x MAX98357A
- Amplifier type: Class D, stereo
- Number of channels: 2
- Output power per channel: 3.2 W at 4 Ω, 10 % THD, 5 V
- Output power per channel: 1.8 W at 8 Ω, 10 % THD, 5 V
- Supply voltage: 2.5–5.5 VDC
- Quiescent current: 2.4 mA
- Efficiency: 92 % at 8 Ω and 1 W output power
- Interface: I²S
- Logic levels: 3.3 V and 5 V
- Sampling frequency: 8–96 kHz
- MCLK: Not required
- Gain: 3, 6, 9, 12 or 15 dB
- Default gain: 9 dB
- Power supply rejection ratio (PSRR): 77 dB at 1 kHz
- Output noise: 25 µV RMS at 15 dB gain
- Distortion (THD+N): 0.015 % at 1 kHz
- Speaker outputs: Bridge-tied load (BTL)
- Protection features: Short-circuit and overtemperature protection
- Dimensions: 25.5 x 19.0 x 11.8 mm
- Pin header: Included (not pre-soldered)